Combustion powder spray

Combustion flame spray is process where powder material is axially fed into the combustion chamber and melted in a gaseous oxygen-fuel flame. In practice, this technique is usually named as: Flame spray, Powder spray, Combustion LVOF.

Although this process is the basis of all advanced thermal spray solutions, development of high efficiency combustion chambers, quality of sprayed coatings have risen. For example, the mechanical properties, compared to Plasma spraying are only 20% inferior, where the bond strength is in the range of 30-40 Mpa which meets the requirements for most of exploitation conditions. Total heat input is significantly lower than Wire arc and Plasma which guarantees less residual stress in the coating.

Unlike other surfacing techniques, powder flame spray is capable of applying all kinds of materials, from metal composites, oxide ceramics to high temperature polymers. Titan Sisak uses very fine powder materials (powder particle size is close to nanoscale),where micro- structure of certain coatings is lamellar with a porosity between 2-4 %.

The best properties are obtained with molybdenum and nickel based materials whose exhibit an exothermic reaction during the spray process so they are considered as self-bonding to steel substrates. Also, they provide very good corrosion resistance and excellent sliding properties.

The specific feature of this process is the application of polymeric materials such as Polyamide 11, used for applications in the chemical industry, highly corrosive environments and food industry components.